Reference: https://www.cisco.com/c/dam/en/us/products/collateral/security/esa-content-filters.pdf

Protect sensitive content in outgoing emails with Data Loss Prevention (DLP) and easy-to-use email encryption, all in one solution.
Cisco Email Security appliance can now handle incoming mail connections and incoming messages from specific geolocations and perform appropriate actions on them, for example:
- Prevent email threats coming from specific geographic regions.
- Allow or disallow emails coming from specific geographic regions.
Protect sensitive content in outgoing emails with Data Loss Prevention (DLP) and easy-to-use email encryption, all in one solution.
Cisco Email Security appliance can now handle incoming mail connections and incoming messages from specific geolocations and perform appropriate actions on them, for example:
- Prevent email threats coming from specific geographic regions.
- Allow or disallow emails coming from specific geographic regions.
Reference:
b_ESA_Admin_Guide_11_0/b_ESA_Admin_Guide_chapter_00.html
Protect sensitive content in outgoing emails with Data Loss Prevention (DLP) and easy-to-use email encryption, all in one solution.
Cisco Email Security appliance can now handle incoming mail connections and incoming messages from specific geolocations and perform appropriate actions on them, for example:
- Prevent email threats coming from specific geographic regions.
- Allow or disallow emails coming from specific geographic regions.
b_ESA_Admin_Guide_11_0/b_ESA_Admin_Guide_chapter_00.html

Explanation
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/eem/command/eem-cr-book/eem-cr-e1.html

Because MAB uses the MAC address as a username and password, you should make sure that the RADIUS server can differentiate MAB requests from other types of requests for network access. This precaution will prevent other clients from attempting to use a MAC address as a valid credential. Cisco switches uniquely identify MAB requests by setting Attribute 6 (Service-Type) to 10 (Call-Check) in a MAB Access-Request message. Therefore, you can use Attribute 6 to filter MAB requests at the RADIUS server.

You can configure discovery rules to tailor the discovery of host and application data to your needs.
The Firepower System can use data from NetFlow exporters to generate connection and discovery events, and to add host and application data to the network map.
A network analysis policy governs how traffic is decoded and preprocessed so it can be further evaluated, especially for anomalous traffic that might signal an intrusion attempt